They do not show a picture of the bottom of the acrylic piece that covers the entire pcb. I would say you more than likely would need to modify the acrylic to clear the extra capacitors on the block. You would also need thicker thermal pads for 3 areas where the VRMs would not make contact w/ the 780 block.

If you are good with a dremel I say go for the 780 block if it is significantly cheaper.